/*
 * Copyright (c) 2019-2020. Developed by Hedgecode.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.hedgecode.chess.scanner.regex.type;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.hedgecode.chess.scanner.regex.AbstractRegexResult;
import org.hedgecode.chess.scanner.regex.RegexMatcher;
import org.hedgecode.chess.scanner.regex.RegexResult;

import static org.hedgecode.chess.scanner.ChessHogScannerConstants.*;

/**
 * RegexBlockFinder
 *
 * @author Dmitry Samoshin aka gotty
 */
public class RegexBlockFinder extends AbstractRegexResult implements RegexMatcher {

    private Pattern startPattern, endPattern;
    private boolean isMatch;
    private StringBuilder current;
    private String key;

    public RegexBlockFinder(String startMatch, String endMatch) {
        startPattern = Pattern.compile(startMatch);
        endPattern = Pattern.compile(endMatch);
        isMatch = false;
        current = new StringBuilder();
    }

    @Override
    public void match(String input) {
        Matcher matcher = !isMatch ? startPattern.matcher(input) : endPattern.matcher(input);
        if (matcher.find()) {
            addCurrent(input);
            if (isMatch) {
                if (key != null) {
                    add(key, current.toString());
                } else {
                    add(current.toString());
                }
                current = new StringBuilder();
            } else {
                key = matcher.groupCount() > 0 ? matcher.group(1) : null;
            }
            isMatch = !isMatch;
        } else {
            if (isMatch) {
                addCurrent(input);
            }
        }
    }

    private void addCurrent(String input) {
        current.append(
                input
        ).append(
                CRLF
        );
    }

    @Override
    public RegexResult result() {
        return this;
    }

}